A 45-year-old man has been arrested in Northern Ireland after a European Arrest Warrant was issued.
The man, from the Roscommon area, was detained in Enniskillen.
He is expected to appear before Belfast's Recorders Court.
It is understood the man had failed to notify police in the Republic of a change of residence as required under the 2001 Sex Offenders Act.
A PSNI spokesman said extradition proceedings would be initiated in due course.